50 * 100 waterproof sleeve

Steel-plastic waterproof embedded sleeve series;

Advantage 1: No need to punch more labor.

Advantage 2: No need to do waterproof more worry.

Advantage 3: There is a strong steel outer layer is stronger, cast-in-place will not crush.

Advantage 4: The lower part has a waterproof layer to effectively avoid water leakage and seepage.